Hey, guys! So I've had my Christmas Tree Worm/Porites colony for about six months now, and have had great success so far. The rock is slightly larger than a golf ball, with at least ten worms, and porites growing over the top half. The worms don't require the coral to survive, but usually have better success with it.
I keep my colony on the sand bed in a medium light area. The worms don't need light, but the corals do best in medium to high lighting.
High flow is best for both the worms and coral. I have a power head blowing almost directly at them, to the point of them bending with the current, and they seem fine with it. The coral also requires it to feed, as the current blows food over it.
I feed them once to twice a week. I use about a teaspoon of Kent PhytoPlex